Try affiliate marketing. This means promoting someone else’s products or services for pay without actually carrying an inventory. There are many ways of incorporating affiliate marketing into your website/blog/page including banner ads (which are generally ineffective, as people tend to avoid these), linked articles (which are quite successful when the article content is thoughtful and doesn’t appear spammy), and product-placement videos (which can be very successful when done by people with charisma or a good sense of humor). You can even become an affiliate marketer without a website. Basic ways of making money through of affiliate marketing include:

The big boys and the big girls move stock prices on Wall Street. Mutual fund companies, large hedge funds and registered investment advisors with hundreds of millions, even billions to invest, seem to have the advantage. Yet an individual investor can still make money. Follow the CAN SLIM system, invented by IBD chairman and founder Bill O'Neil, of selecting, buying and selling stocks, to a T.

As I’ve thought more deeply about how to answer this question over the years, I’ve come to a realization that the problem is not the answer, but the question itself. For those who’ve asked it, I don’t think it’s always coming from a place of “quick money.” If we reframe the question, I think there’s room to empower and actually help those who’ve asked it—to give them a foundational understanding of what it really means to generate an income online.
Re-selling web hosting will enable you to make money hosting your own client’s websites. Large hosting companies like HostGator allow you to white label their hosting services. You could start your own hosting business or, if you are a web designer, include hosting into your web design packages. And the best of it is the hosting companies take care of the hosting for you, so all you need to worry about is selling.
So when I'm looking for REITs, I hunt for experienced management teams with a great track record. These executives should have industry contacts that allow them to source deals that may not be available to larger players. These are the reasons I like Jernigan Capital (NYSE:JCAP) in the storage space. It's run by industry veteran Dean Jernigan, who spent seven years at the helm of CubeSmart and then ventured out on his own with this small REIT, now just a $379 million market cap. A few deals for Jernigan can really move the needle, while its publicly traded peers – all of which are substantially larger – must acquire dozens of assets each year to move the needle on growth. It also doesn't hurt that Jernigan pays a 7% yield. I'll have a piece soon that explains more about this tiny REIT. In the meantime, here's a rundown on storage REITs.
Great intro on investing in small (and larger) apartments. Teaches you the philosophy and mindset needed to be successful. Teaches you about marketing, financing with little or no money down (using other people's money), what a CAP Rate is - Cash on Cash Return is, how to analyze a property, touches on wholesaling, direct mailing, a lot of good information in simple language. He does try to sell you on a couple of his programs and packages throughout but besides that it's a top notch book.
Drop shipping is another great ‘hands-off’ way to sell products. Firstly you will need to find businesses that sell products in your niche that offer a drop shipping service. Then you will need to create a website promoting and selling the products. When you make a sale, you take the payment on your site and then the manufacturer ships the goods to the buyer. The profit comes from charging a higher rate than the manufacturer, and if you are selling a high number of products this can quickly add up to a healthy revenue.
If my piece of content is so unique and valuable around hiking backpack recommendations, that other reputable outdoor websites are willing to link to it and build the page’s authority, then I’d have a very real opportunity to rank high in organic search for these search terms (meaning, my page will come up first when someone searches for hiking backpacks).
This has become a popular business model for online entrepreneurs over the past several years, and will probably just continue to grow in popularity. The best thing about selling online courses is that once you do the up-front work in creating the course and setting up your marketing strategy, you can get paid over and over again for work you do once.